Problems

• ## Recent Problems

How many different triangles are there in the figure?
Problems
Geometry
Classify two-dimensional figures into categories based on their properties.
5.G.B.4

It’s not too hard to form the number 9 using three 3’s and any of the four standard mathematical operations +, –, × and ÷. But can you come up with four different solutions, each of which uses only one of the four operations? (Other standard mathematical symbols can be used as needed.)

9 = 3 + 3 + 3

Problems
Algebraic Thinking
Write and interpret numerical expressions.
Multiply and divide within 100.
3.OA.C.7, 5.OA.A.1
When the ends of the rope at left are pulled in opposite directions, how many knots will be formed along the rope's length?
Problems
Write 2014 with the first four prime numbers, with the aid of the operations addition, multiplication and exponentiation.
Problems
Grades: 6th to 8th, 3rd to 5th
Expression/Equation
Algebraic Thinking
Apply and extend previous understandings of arithmetic to algebraic expressions.
Gain familiarity with factors and multiples.
Multiply and divide within 100.
3.OA.C.7, 4.OA.B.4, 6.EE.A.1